NDLI: A hierarchical algorithm for nearfield acoustic imaging

Content Provider	IEEE Xplore Digital Library
Author	Peake, M. Karan, M. Gray, D.
Copyright Year	2000
Description	Author affiliation: Cooperative Res. Centre for Sensor Signal & Inf. Process., Mawson Lakes, SA, Australia (Peake, M.)
Abstract	This paper presents a computationally efficient hierarchical nearfield imaging algorithm using a delay and sum beamformer with a random array via pulse-echo techniques. In the conventional imaging of nearfield sources, signals from multiple sensors are delayed and summed to focus at points in the imaging volume. However, the computational burden of implementing the conventional algorithm for arrays with a large number of receivers, due to the distance calculations, requires new suboptimal algorithms. The algorithm described in this paper reduced computational time balanced against a reasonable memory requirement. The key principle of this algorithm is to implement the delay and sum by grouping receivers into various subarrays in a number of stages. Mirroring the hierarchy of subarrays is a decomposition of imaging volume beginning with large voxels and progressively reducing the voxel size. This algorithm introduces two main changes to the conventional algorithm which are (i) subsampling of the received data, which is then compensated by phase interpolations, (ii) a hierarchy of subarrays and subvolumes to combine the data from all the receivers. Comparison of the conventional and the hierarchical algorithms are done in terms of their point spread functions.
Starting Page	712
Ending Page	716
File Size	492537
Page Count	5
File Format	PDF
ISBN	0780359887
DOI	10.1109/SSAP.2000.870219
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2000-08-16
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Acoustic imaging Sensor arrays Delay Image sensors Frequency Signal resolution Acoustic sensors Transmitters Australia Pulse modulation
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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